Electrode Reaction of Pu3+/Pu Couple in LiCl-KCl Eutectic Melts: Comparison of the Electrode Reaction at the Surface of Liquid Bi with That at a Solid Mo Electrode.

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  • SHIRAI Osamu
    Department of Nuclear Energy System, Japan Atomic Energy Research Institute
  • IIZUKA Masatoshi
    Nuclear Fuel Cycle Department, Central Research Institute of Electric Power Industry
  • IWAI Takashi
    Department of Nuclear Energy System, Japan Atomic Energy Research Institute
  • ARAI Yasuo
    Department of Nuclear Energy System, Japan Atomic Energy Research Institute

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  • Electrode Reaction of Pu〔3+〕/Pu Couple in LiCl-KCl Eutectic Melts: Comparison of the Electrode Reaction at the Surface of Liquid Bi with That at a Solid Mo Electrode

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Description

The electrode reaction of Pu3+/Pu couple at the interface between LiCl-KCl eutectic melt containing PuCl3 and liquid Bi phase was investigated by cyclic voltammetry at 723, 773 and 823 K. For comparison, the system was also studied using a solid Mo electrode in place of the liquid Bi electrode. It was found that the electrode reaction of Pu3+/Pu couple at the Bi electrode was almost reversible. The redox potentials of Pu3+/Pu couple at the liquid Bi electrode in the LiCl-KCl eutectic melt containing 0.87 wt% PuCl3 (0.0014 mole fraction) at 723, 773 and 823 K were observed to be more positive by 0.575, 0.572 and 0.566 V, respectively, than those at the Mo electrode. These differences in potential were thermodynamically analyzed by assuming a lowering of the activity of Pu in Bi phase according to the alloy formation of PuBi2.

Journal

  • Analytical Sciences

    Analytical Sciences 17 (1), 51-57, 2001

    The Japan Society for Analytical Chemistry

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